Re: [Discuss-gnuradio] fix for usrp2 overruns when stopping and restarting rx streaming

[Andy_Long]

Hi, Martin

Can you put your version number if you have solved it?

thank you.
Andy


Martin Dvh wrote:
> 
> Hi All,
> 
> When you use an USRP2 for capturing and you call
> 
> u2->stop_rx_streaming()
> 
> and later
> 
> u2->start_rx_streaming(0)
> 
> You always get a single overrun.
>  -a single 'S' is output on the console
>  -u2->rx_overruns() returns 1 (in stead of 0)
> 
> I am developing a usrp2 application which does not permit any overrun
> conditions, so this needed fixing.
> 
> It turns out that the expected sequence number of received samples is
> not reset when stopping the stream.
> 
> This single line patch fixes this.
> 
> 
> Best Regards,
> 
> Martin
> 
> diff --git a/usrp2/host/lib/usrp2_impl.cc b/usrp2/host/lib/usrp2_impl.cc
> index b19c6ec..92d52db 100644
> --- a/usrp2/host/lib/usrp2_impl.cc
> +++ b/usrp2/host/lib/usrp2_impl.cc
> @@ -814,6 +814,7 @@ namespace usrp2 {
>        success = transmit_cmd_and_wait(&cmd, sizeof(cmd), &p,
> DEF_CMD_TIMEOUT);
>        success = success && (ntohx(reply.ok) == 1);
>        d_channel_rings[channel].reset();
> +      d_rx_seqno=-1;
>        //fprintf(stderr, "usrp2::stop_rx_streaming:  success = %d\n",
> success);
>        return success;
>      }
> 
> 
> 
> 
> 
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> 
> 

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